Breaking Changes — Identifying and Communicating Breaking Changes

In this tutorial, you will learn about Breaking Changes. We cover key concepts, practical examples, and best practices to help you master this topic.

Breaking changes require a new API version and clear communication to affected clients, including Migration guides, deprecation timelines, and sunset headers.

Identifying Breaking Changes

Use automated tools to detect breaking changes between spec versions. Create a breaking change checklist for every API change. Review all changes before release.

Communication

Publish breaking changes in changelog at least 3 months before release. Send direct notifications to known API consumers. Include migration guides and sunset deadlines.

Common Mistakes

1. Surprise breaking changes — No notice before breaking clients.
2. No migration guide — Telling clients something changed but not how to adapt.
3. Too short migration window — Less than 3 months notice.

Practice Questions

1. How do you detect breaking changes automatically?
2. How much notice should clients get?
3. What should a migration guide include?

Challenge

Write a breaking change notice for an API migration from v1 to v2. Include what changed, migration steps, timeline, and sunset date.

What's Next

In the next lesson, you will learn deprecation headers.